freestyle not rendering open ends
If i understood the question the pointed area of the wrist cuffs is render with freestyle line and the arm is not.

Reason is the wrist cuffs has a fill mesh.

Look this way.



And the arm line is just a line not filled

How can you make it fill.

Just select the verts and Press Shift+D to duplicate little below the line.

Select the duplicate and the above original line and press F key

Now render and get the Freestyle render